Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
On-Board System Readiness (OSR) Test Mode
All OBD-II scan testers must display OSR test. The OSR will display monitors on the vehicle and status of all monitors; complete or not complete. If not complete, the scan tester will display which monitor has not completed.
To enter OSR, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps:
- Select vehicle and engine selection menu (optional). See Figure.
- Select year, engine, model and any additional information requested by scan tester.
- Follow operating instructions from scan tester menu.
- Select GENERIC OBD-II FUNCTIONS. Press TEST button if monitors are not complete.
- Start engine and allow to idle.
- Select ON-BOARD SYSTEM READINESS.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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